--- **AceConsole-3.0** provides registration facilities for slash commands.
-- You can register slash commands to your custom functions and use the `GetArgs` function to parse them
-- to your addons individual needs.
--
-- **AceConsole-3.0** can be embeded into your addon, either explicitly by calling AceConsole:Embed(MyAddon) or by
-- specifying it as an embeded library in your AceAddon. All functions will be available on your addon object
-- and can be accessed directly, without having to explicitly call AceConsole itself.\\
-- It is recommended to embed AceConsole, otherwise you'll have to specify a custom `self` on all calls you
-- make into AceConsole.
-- @class file
-- @name AceConsole-3.0
-- @release $Id: AceConsole-3.0.lua 1284 2022-09-25 09:15:30Z nevcairiel $
local MAJOR, MINOR = "AceConsole-3.0", 7

local AceConsole, oldminor = LibStub:NewLibrary(MAJOR, MINOR)

if not AceConsole then
    return
end -- No upgrade needed

AceConsole.embeds = AceConsole.embeds or {} -- table containing objects AceConsole is embedded in.
AceConsole.commands = AceConsole.commands or {} -- table containing commands registered
AceConsole.weakcommands = AceConsole.weakcommands or {} -- table containing self, command => func references for weak commands that don't persist through enable/disable

-- Lua APIs
local tconcat, tostring, select = table.concat, tostring, select
local type, pairs, error = type, pairs, error
local format, strfind, strsub = string.format, string.find, string.sub
local max = math.max

-- WoW APIs
local _G = _G

local tmp = {}
local function Print(self, frame, ...)
    local n = 0
    if self ~= AceConsole then
        n = n + 1
        tmp[n] = "|cff33ff99" .. tostring(self) .. "|r:"
    end
    for i = 1, select("#", ...) do
        n = n + 1
        tmp[n] = tostring(select(i, ...))
    end
    frame:AddMessage(tconcat(tmp, " ", 1, n))
end

--- Print to DEFAULT_CHAT_FRAME or given ChatFrame (anything with an .AddMessage function)
-- @paramsig [chatframe ,] ...
-- @param chatframe Custom ChatFrame to print to (or any frame with an .AddMessage function)
-- @param ... List of any values to be printed
function AceConsole:Print(...)
    local frame = ...
    if type(frame) == "table" and frame.AddMessage then
        -- Is first argument something with an .AddMessage member?
        return Print(self, frame, select(2, ...))
    else
        return Print(self, DEFAULT_CHAT_FRAME, ...)
    end
end


--- Formatted (using format()) print to DEFAULT_CHAT_FRAME or given ChatFrame (anything with an .AddMessage function)
-- @paramsig [chatframe ,] "format"[, ...]
-- @param chatframe Custom ChatFrame to print to (or any frame with an .AddMessage function)
-- @param format Format string - same syntax as standard Lua format()
-- @param ... Arguments to the format string
function AceConsole:Printf(...)
    local frame = ...
    if type(frame) == "table" and frame.AddMessage then
        -- Is first argument something with an .AddMessage member?
        return Print(self, frame, format(select(2, ...)))
    else
        return Print(self, DEFAULT_CHAT_FRAME, format(...))
    end
end




--- Register a simple chat command
-- @param command Chat command to be registered WITHOUT leading "/"
-- @param func Function to call when the slash command is being used (funcref or methodname)
-- @param persist if false, the command will be soft disabled/enabled when aceconsole is used as a mixin (default: true)
function AceConsole:RegisterChatCommand(command, func, persist)
    if type(command) ~= "string" then
        error([[Usage: AceConsole:RegisterChatCommand( "command", func[, persist ]): 'command' - expected a string]], 2)
    end

    if persist == nil then
        persist = true
    end  -- I'd rather have my addon's "/addon enable" around if the author screws up. Having some extra slash regged when it shouldnt be isn't as destructive. True is a better default. /Mikk

    local name = "ACECONSOLE_" .. command:upper()

    if type(func) == "string" then
        SlashCmdList[name] = function(input, editBox)
            self[func](self, input, editBox)
        end
    else
        SlashCmdList[name] = func
    end
    _G["SLASH_" .. name .. "1"] = "/" .. command:lower()
    AceConsole.commands[command] = name
    -- non-persisting commands are registered for enabling disabling
    if not persist then
        if not AceConsole.weakcommands[self] then
            AceConsole.weakcommands[self] = {}
        end
        AceConsole.weakcommands[self][command] = func
    end
    return true
end

--- Unregister a chatcommand
-- @param command Chat command to be unregistered WITHOUT leading "/"
function AceConsole:UnregisterChatCommand(command)
    local name = AceConsole.commands[command]
    if name then
        SlashCmdList[name] = nil
        _G["SLASH_" .. name .. "1"] = nil
        hash_SlashCmdList["/" .. command:upper()] = nil
        AceConsole.commands[command] = nil
    end
end

--- Get an iterator over all Chat Commands registered with AceConsole
-- @return Iterator (pairs) over all commands
function AceConsole:IterateChatCommands()
    return pairs(AceConsole.commands)
end

local function nils(n, ...)
    if n > 1 then
        return nil, nils(n - 1, ...)
    elseif n == 1 then
        return nil, ...
    else
        return ...
    end
end


--- Retreive one or more space-separated arguments from a string.
-- Treats quoted strings and itemlinks as non-spaced.
-- @param str The raw argument string
-- @param numargs How many arguments to get (default 1)
-- @param startpos Where in the string to start scanning (default  1)
-- @return Returns arg1, arg2, ..., nextposition\\
-- Missing arguments will be returned as nils. 'nextposition' is returned as 1e9 at the end of the string.
function AceConsole:GetArgs(str, numargs, startpos)
    numargs = numargs or 1
    startpos = max(startpos or 1, 1)

    local pos = startpos

    -- find start of new arg
    pos = strfind(str, "[^ ]", pos)
    if not pos then
        -- whoops, end of string
        return nils(numargs, 1e9)
    end

    if numargs < 1 then
        return pos
    end

    -- quoted or space separated? find out which pattern to use
    local delim_or_pipe
    local ch = strsub(str, pos, pos)
    if ch == '"' then
        pos = pos + 1
        delim_or_pipe = '([|"])'
    elseif ch == "'" then
        pos = pos + 1
        delim_or_pipe = "([|'])"
    else
        delim_or_pipe = "([| ])"
    end

    startpos = pos

    while true do
        -- find delimiter or hyperlink
        local _
        pos, _, ch = strfind(str, delim_or_pipe, pos)

        if not pos then
            break
        end

        if ch == "|" then
            -- some kind of escape

            if strsub(str, pos, pos + 1) == "|H" then
                -- It's a |H....|hhyper link!|h
                pos = strfind(str, "|h", pos + 2)  -- first |h
                if not pos then
                    break
                end

                pos = strfind(str, "|h", pos + 2)  -- second |h
                if not pos then
                    break
                end
            elseif strsub(str, pos, pos + 1) == "|T" then
                -- It's a |T....|t  texture
                pos = strfind(str, "|t", pos + 2)
                if not pos then
                    break
                end
            end

            pos = pos + 2 -- skip past this escape (last |h if it was a hyperlink)

        else
            -- found delimiter, done with this arg
            return strsub(str, startpos, pos - 1), AceConsole:GetArgs(str, numargs - 1, pos + 1)
        end

    end

    -- search aborted, we hit end of string. return it all as one argument. (yes, even if it's an unterminated quote or hyperlink)
    return strsub(str, startpos), nils(numargs - 1, 1e9)
end


--- embedding and embed handling

local mixins = {
    "Print",
    "Printf",
    "RegisterChatCommand",
    "UnregisterChatCommand",
    "GetArgs",
}

-- Embeds AceConsole into the target object making the functions from the mixins list available on target:..
-- @param target target object to embed AceBucket in
function AceConsole:Embed(target)
    for k, v in pairs(mixins) do
        target[v] = self[v]
    end
    self.embeds[target] = true
    return target
end

function AceConsole:OnEmbedEnable(target)
    if AceConsole.weakcommands[target] then
        for command, func in pairs(AceConsole.weakcommands[target]) do
            target:RegisterChatCommand(command, func, false, true) -- nonpersisting and silent registry
        end
    end
end

function AceConsole:OnEmbedDisable(target)
    if AceConsole.weakcommands[target] then
        for command, func in pairs(AceConsole.weakcommands[target]) do
            target:UnregisterChatCommand(command) -- TODO: this could potentially unregister a command from another application in case of command conflicts. Do we care?
        end
    end
end

for addon in pairs(AceConsole.embeds) do
    AceConsole:Embed(addon)
end
